Ametherm MS35 0R550

The MS35 0R550 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 50A (up to +25°C) and a resistance of 0.5Ω ±25% (at 25°C). Ametherm's MegaSurge™ series of inrush current limiting thermistors are capable of handling up to 900 joules of energy and 50 amperes of steady state current. These power thermistors are rugged and built to last even in the most demanding high power applications. The Ametherm MS35 devices play a key role in alternative energy applications by avoiding current spikes in the power generated by wind turbines, solar panels, and other sources as it's fed into batteries, inverters, and other energy storage components. These MegaSurge™ devices are also used to regulate the release of battery energy in electric vehicles and in pre-charge circuits for many different types of battery chargers.

Inrush current limiting thermistor

Resistance of 0.5Ω ±25% (at 25°C)

Maximum steady state current of 50A (up to +25°C)

Maximum recommended energy of 500J (Actual energy failure at 1800J)

0.01Ω at 100% maximum current and 0.02Ω at 50% maximum current

Body temperature of +215°C at maximum current

Material type B (for beta and curve)

Dissipation constant of 78mW/°C

Thermal time constant of 240mW/s

Typical applications for the MS35 series include:

Regulate the release of battery energy in electric vehicles and in pre-charge circuits for many different types of battery chargers.

Power generated by wind turbines, solar panels, and other sources as it's fed into batteries, inverters, and other energy storage components

The below table gives the full specifications of the Ametherm MS35 0R550 series:

Specifications

Additional Features

Inrush current limiting thermistor

Suitable for high energy and short term high current applications

Dissipation constant 78mW/°C

Thermal time constant 240mW/s

Material type B (for beta and curve)

Body Temperature

+215°C (at maximum current)

Maximum Recommended Energy

500J (actual energy failure at 1800J)

Maximum Steady State Current (upto +25°C)

50A

Resistance at &plus;25°C

0.5Ω

Resistance at 100% Maximum Current (RImax)

0.01Ω

Resistance at 50% Maximum Current (RImax)

0.2Ω

Tolerance

±25%

We are pleased to provide you with a range of additional content including videos, product datasheets, case studies, white papers and application notes for your reference. Please see below for the latest content available:

Learn how to limit inrush current using NTC and PTC thermistors in this presentation by Ametherm.

Many applications today, including industrial machinery, power tools and other high current equipment, use limiting inrush current as a major design consideration to combat the problematic effects of inrush current.

Inrush current occurs when a system powers on and experiences a spike in current. This current can be substantially higher than standard operating current. If not properly managed, it can reduce the effective operating life and impose damage to equipment. For example, inrush current could disable a cooling fan, eventually leading to total system failure.

Applications that are switched on and off quickly, such as welding equipment, present a particular concern for limiting inrush current. The limiting inrush current circuit must reset instantaneously during each power on to protect the system. This further complicates the management of inrush current.

NTC stands for Negative Temperature coefficient. The NTC thermistor provides variable resistance based on temperature. As temperature increases, the resistance drops from high to low and allows current to pass through.

PTC stands for Positive Temperature Coefficient. The PTC thermistor also provides variable resistance based on temperature. As temperature rises, resistance increases from low to high and blocks inrush current.

Typically, NTC-based limiting is used for most applications. However, there are certain scenarios that require a PTC thermistor over an NTC thermistor. These include equipment with a near-zero reset time, extreme temperature conditions, and systems that experience frequent shorts.

Limiting Inrush Current for a 40VA Transformer

Inrush current often causes problems for transformers. This video will show you how to calculate the right inrush current limiter for your transformer in 7 simple steps.

DC Motor Inrush Current and What You Need to Know

What does inrush current have to do with DC motors? This video answers that question by discussing the cause of DC motor inrush current and how to prevent the inrush of current at startup from possibly damaging the DC motor with the use of Ametherm's Inrush Current Limiters. They start by explaining how a DC motor functions, its applications and key components, how inrush current factors in, how to solve the problem of inrush current, and how to select the right inrush current limiter for your application with three easy steps.

VIDEOS

Limiting Inrush Current with NTC and PTC Themistors

Learn how to limit inrush current using NTC and PTC thermistors in this presentation by Ametherm.

Many applications today, including industrial machinery, power tools and other high current equipment, use limiting inrush current as a major design consideration to combat the problematic effects of inrush current.

Inrush current occurs when a system powers on and experiences a spike in current. This current can be substantially higher than standard operating current. If not properly managed, it can reduce the effective operating life and impose damage to equipment. For example, inrush current could disable a cooling fan, eventually leading to total system failure.

Applications that are switched on and off quickly, such as welding equipment, present a particular concern for limiting inrush current. The limiting inrush current circuit must reset instantaneously during each power on to protect the system. This further complicates the management of inrush current.

NTC stands for Negative Temperature coefficient. The NTC thermistor provides variable resistance based on temperature. As temperature increases, the resistance drops from high to low and allows current to pass through.

PTC stands for Positive Temperature Coefficient. The PTC thermistor also provides variable resistance based on temperature. As temperature rises, resistance increases from low to high and blocks inrush current.

Typically, NTC-based limiting is used for most applications. However, there are certain scenarios that require a PTC thermistor over an NTC thermistor. These include equipment with a near-zero reset time, extreme temperature conditions, and systems that experience frequent shorts.

Limiting Inrush Current for a 40VA Transformer

Inrush current often causes problems for transformers. This video will show you how to calculate the right inrush current limiter for your transformer in 7 simple steps.

DC Motor Inrush Current and What You Need to Know

What does inrush current have to do with DC motors? This video answers that question by discussing the cause of DC motor inrush current and how to prevent the inrush of current at startup from possibly damaging the DC motor with the use of Ametherm's Inrush Current Limiters. They start by explaining how a DC motor functions, its applications and key components, how inrush current factors in, how to solve the problem of inrush current, and how to select the right inrush current limiter for your application with three easy steps.

This product is available fully compliant to the RoHS EU directive 2011/65/EU.

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